71 lines
2.1 KiB
C#
71 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace Ooui
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{
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public abstract class Node : EventTarget
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{
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readonly List<Node> children = new List<Node> ();
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public IEnumerable<Message> AllStateMessages =>
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StateMessages
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.Concat (from c in children from m in c.AllStateMessages select m)
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.OrderBy (x => x.Id);
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public virtual string Text {
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get { return String.Join ("", from c in children select c.Text); }
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set {
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ReplaceAll (new TextNode (value ?? ""));
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}
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}
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protected Node (string tagName)
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: base (tagName)
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{
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}
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public Node AppendChild (Node newChild)
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{
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return InsertBefore (newChild, null);
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}
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public Node ParentNode { get; private set; }
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public Node InsertBefore (Node newChild, Node referenceChild)
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{
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if (referenceChild == null) {
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children.Add (newChild);
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}
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else {
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var index = children.IndexOf (referenceChild);
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if (index < 0) {
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throw new ArgumentException ("Reference must be a child of this element", nameof(referenceChild));
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}
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children.Insert (index, newChild);
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}
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newChild.ParentNode = this;
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SendCall ("insertBefore", newChild, referenceChild);
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return newChild;
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}
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public Node RemoveChild (Node child)
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{
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if (!children.Remove (child)) {
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throw new ArgumentException ("Child not contained in this element", nameof(child));
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}
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child.ParentNode = null;
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SendCall ("removeChild", child);
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return child;
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}
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protected void ReplaceAll (Node newNode)
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{
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var toRemove = new List<Node> (children);
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foreach (var c in toRemove)
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RemoveChild (c);
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InsertBefore (newNode, null);
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}
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}
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}
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